Electric signal-transmitting mechanism



June 24 1924. 1,498,723

J. C. FRANCIS ELECTRIC SIGNAL TRANSMITTING MECHANISM Filed June 30, 1920 4 Sheets-Sheet 1 Fig.1.

" John QFruncis Aflys June 24 1924. 7 1,498,723

v C. FRANCIS ELECTRIC SIGNAL TRANSMITTING MECHANISM Filed June so. 1920 4 Sheets-Sheet 2 InvenTor.

John C. Francis YMMkW Afiys.

June 24 1924. 1,498,723

. J. c. FRANCIS ELECTRIC SIGNAL TRANSMITTING MECHANISM Filed June 30, 1920 4 Sheets-Sheet 5 Fig.5. 1

l n ve nTo r. John C. Francis WWW AIM Afiys.

June 24 1924.

- 1,498,723- J; Q-FRANCIS ELECTRIC SIGNAL TRANSMITTING MECHANISM Filed June 30, 1920 4 Sheets-sheaf:

\nvenToT. John C. Francis byMMQW A'ITys..

Patented June 24, 1924.

JOHN C. FRANCIS, or oAN'roN, MAssaonUsET'rs, ASSIGNOR To SAMSON ELECTRIC COMPANY, or oANrroN, MASSACHUSETTS, A CORPORATION or MASSACHUSETTS.

ELECTRIC SIGNAL-TRANSMITTING MECHANISM.

Application filed'June 30,1920. Serial No. 392,968.

T aZZ whom it may concern."

Be it known that I, JOHN C. FRANCIS,

a citizen of the United States, and resident of Canton, county of Norfolk, State of Massachusetts, have invented an Improvement in Electric Signal-Transmitting Mechanisms, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts. This invention relates to lmprovements in electric signalling mechanisms for sending two or more'distinctive signals over a single circuit, or-over a plurality of circuits in which the transmission devices are operated by asinglemechanism.

More specifically theinvention relates to improvements in firealarmsignalling mechanism which is operable to transmit various signals distantly or locally'efiective, or

both, such as thetr'ansmission of a watchmans signal to a centra-lstation, the giving of a local fire signal tothe central station, or the transmissionof a signalto local gongs distributed through the plant or factory in which the fire alarm signalis' installed.

The principal object of'the-invention is to provide asimple and positive means for conditioning the circuits in a signalling device so as to transmit different signals through the various circuits without modification of the actuating mechanism. The mechanism for effecting this result comprises a main spindle which is adapted to be operated, to a limited extent, by awatchma-ns key and a winding spindle which is operable by alever or which: is'controlled by automatic releasing mechanism,- the winding spindlehaving means for control- 40 ling the circuit conditioning mechanism so that a different signal may be transmitted when the main spindle is operated by the" watchmans'key than that which istransmitted when the winding spindle-is operated. If, for example, the mechanismwere used as a combination fire and watchmans signal the main spindle is-operated by the watchmans key to send in one, or any predetermined number-of rounds'which may be of a different code number from't-hat of thefire. signal and may be transmittedat a greater speed than thefire signal ifdesired. The mechanismis so constructed that the sending-in ofthe signal by the watchmans key does not change the circuits or' the: spring contacts for the fire alarm system from their normal at rest position. When, however, the main spindle is operated'by the pulling of' the fire lever a full, predetermined number of'rounds is transmitted to the central station as a distinct fire signal, or, by a simple modification or adjustment the mechanisms can be madeto select which one or more of a plurality of signal circuitsshall be operated and, therefore, what signals shall be transmitted. This is accomplished by providing cams whichare controlled 7 preferably from the winding spindle and are operable to actuate circuit conditioning contact springs "which either shunt or open connections leading to severalcode wheel contact springs.

The signalling mechanism may be provided with one, two, or any number of code wheels, each with its contact springs, and the cam actuated springs may be eitherasingle'pair or several pairs connected by suitable wirings toaccomplish the desired result. I V

A variety of combinationsof signaltransmitting means may thus be employedin sig-- nall-ing boxes of the same type of mechanism differing only in details.

The signals transmitted by such devicesmay be'caused to operate a single relay, or may be caused toactuate separate relays as may be desiredin accordance with-the well known practice in the art.

The-preferred embodiment of the invention is disclosed herein as-applied to fire signalling system, but it will be understood that the invention may be used for various other purposes,

In the drawings: a

Fig. 1' is afront elevation of a signalling box; with the outer door open, i V

Fig. 2 is a front elevation of a signallingbox with the inner door" open, showing the" box connections and portions of the signal? lingtransmitting mechanisms,

Fig; Sis a detail elevation of the trans-- mitting mechanism viewed from the side opposite to that shown in Fig. 2, I

Fig. 4 is a detail View of portions of thetransmitting mechanism, one of the casing plates of the same being removed, the-shafts accompanying for the various spindles, arbors and rods connecting the casing members being shown in section,

Fig. 5 is a side elevation of the transmitting mechanism,

Fig. 6 is a detail view of the disk which is operable by the watchmans key,

Fig. 7 is a diagrammatic view of a wiring system employed in connection with the mechanism illustrated in Figs. 1 to 6,

Fig. 8 is a diagrammatic vew of a difierent wiring system which may be employed in connection with the same mechanism by the provision of an additional code wheel and circuit conditioning means,

Fig. 9 is a diagrammatic view of another wiring system which may be employed. with the same mechanism by the mere addition of code wheels and suitable circuit conditioning devices,

Fig. 10 is an elevation of a modified form of transmitting mechanism through which signals may be transmitted over the main line to the central station and also transmitted through a supplemental or local gong circuit by the operation of a separate break wheel than that which is used to operate the main line.

Fig. 11 is a similar view of another modified form of contact conditioning mechanism comprising separate break wheels for certain branches of the signalling system adapted to operate separate relays, the signals upon the main circuit or watchmans circuit being received upon a high resistance relay while the fire signals are received upon a low resistance relay.

The signalling device illustrated in the drawings comprises the usual. hollow box 1, having secured therein an insulated plate 2 carrying terminals 3, said box being provided at the top and bottom with the usual apertures for the conduit pipes through which the wires are carried into and out of the box. A door 4, which is hinged to the box, carries upon its rear the mechanism for transmitting the signals and an outer door 5, which is also hinged to the box preferably upon the same spindles. serves to cover the fire signalling lever and to prevent the same from being tampered with. Suitable means, such as are commonly used, may be provided for locking the outer door to the inner door which may be released by the breaking of the usual protective glass plate so that the outer door will automatically be swung open when the glass is broken.

The outer door is provided with the usual aperture 6 to permit the insertion of the watchmans key in order that the. watchman may send in the signal wit iout opening the outer door. Inasmuch as these mechanisms are familiar in the art. further description is deemed unnecessary.

The signalling mechanism. which is supported upon the inner face of the inner door, comprises a frame consisting of two preferably circular plates 7 and 8 which are secured together in spaced relation by suitable screws surrounded by spacing sleeves 9, the plates 7 andS being provided with journals for the various shafts and arbors of thetransmission mechanism.

This transmission mechanism comprises a main spindle 10 to which is secured one end of the usual motor spring 11 the other end of the motor spring being secured to a stud 12 upon the plate 7. A ratchet 13, which is fixedly secured to the spindle 10, engages a pawl 14 which is pivoted upon a gear 15 which is rotatably mounted upon the spindle 10, said pawl being held in contact with the ratchet by a spring 15*, so that upon winding the spring the pawl will slip over the teeth of the ratchet, but upon release of the winding mechanism the spring will act through the pawl 14. to rotate the gear 15.

he gear 15 engages a pinion upon a shaft 17 which carries the break wheels 18 and 19 which are provided with code teeth adapted upon the rotation of said break wheels to open or close the signalling circuits. In the system illustrated herein the signalling circuit is normally closed, a supervising current being at all times sent through the. same. The break wheel 18 is dapted to break this circuit and thereby to actuate the signalling mechanism. The break wheel 19, which is also carried by the break wheel shaft, serves to control and open a lt'lcCulloiigh or grounded, circuit of a usual type which is normally open and operates to close suitable contacts for actu ating the signalling mechanism when a break occurs in the main signaling circuit.

In order to provide for the removal and replacement of the break wheels, and the substitution of ditferent break wheels, the break wheel shaft 17 is provided at its end with a collar upon which'said break wheels are seated and are clamped by a suitable nut 20 and a washer 21. The break shaft 17 is also provided with a gear 22 which engages a pinion 23 upon the arbor 24 of an escape wheel 25, the usual pallet 26 and oscillating fan 27 serving to regulate the ro tation of the escapeinent wheel and consequently the speed of the rotation of the various mechanisms.

An anchor cam 28. which is fixedly secured to the main spindle 10. is provided with an arcuate face adapted to engage stud 29 upon the gear 22 on the break wheel shaft, this stop being so formed that when the main spindle is turned a short distance by the watchmans key the anchor cam will be withdrawn from the path of the stud 29 sufiiciently to permit the gear 22 to make rec one revolution, when the stud 29 will again engage the anchor cam 28. lVhen, however, the mechanism is wound up fully by the actuation of the fire lever the anchor cam 28 will be rotated sufiiciently to permit the gear 22 to have a predetermined plurality of rotations before the stud 29 again engages the anchor cam. Consequently the break wheel? will transmit a predetermined number of repeated signals.

In order to provide for the sending in of a report signal or wa-tchmans signal, without transmitting a fire signal, means are provided to enable the watchmans key to rotate the main spindle and wind the mechanism a predetermined limited amount without disturbing the winding spindle. The preferred means which is disclosed herein comprises a disk 30 (see Fig. 6) which is freely mounted upon the end of the main spindle 10 and is provided with a square boss 31 for the key which is located directly beneath the key-hole 6 in the outer and inner cases. The disk 30 is provided with a cut-out sector 32 presenting shoulders 33 and 34 which are adapted to engage a stud 35 fixedly secured to the inner faces of the inner door and thus to limit the movement of the disk 30. The under'face of the disk 30 is provided with a stud 36 positioned to en gage a pin 37. which is fixedly secured to the main spindle 10. It will be obvious, therefore, that when the watchmans key is placed upon the squared portion 31 of the disk 30 and rotated in the proper direction the stud 36 acting upon the pin 37 will rotate the winding shaft 10 until the shoulder 33 upon said disk engages the stud 35. The amount of rotation thus imparted to the winding shaft by the watchmans key causes the pawl 14 to step one tooth of the ratchet 13, the teeth of the ratchet being so constructed that each. tooth causes one rotation of the break wheel. By reason of this construction the main winding spindle may be operated by the ,watchmans key independently of any actuation. of the mechanism by the fire lever.

The fire lever 38, which is located outside of the inner. door 4, is fixedly secured to the end of a winding spindle 39 which isjournalled in the frame plates 7 and 8. A helical spring 40 (see Fig. 5), surrounding said spindle anchored at one end thereto and at the opposite end to one of the spacing posts 9 of the frame, serves normally to hold the lever in elevated position. Suitable means are provided for rotating the main spindle by the pulling down of the fire lever 38 so that the break wheels may be given a number of rotations and thereby caused to repeat the fire signals a desired number of times. This is accomplished by providing a sector 41 of large diameter to engage a pinion 42 upon the main spindle. This sector might,

of course, be fixedly secured tothe winding spindle 39, but preferably is so connected therewith that actuation of the fire lever, after a signalhas once been pulled, will not interfere with the operation of the macha- DlSIIl until the entire series of signals has been sent in. To accomplish this purpose the sector 41 is rotatably mounted upon the winding spindle 39 and is provided with a hub 43 having a. shoulder or stop 44 which is adapted to be engaged by the forked end of a pawl 45 which is pivotally mounted upon a stud 46 upon a pawl carrier 47 which is fixedly secured. to the winding spindle 39.

The pawl 45 is provided with a tail 48 which, when the mechanism is at rest, is engaged by a spring 49 suitably secured to the frameplate 7 which normally holds the pawl 45 in a position to engage the stop 44 upon thev downward pull of the fire lever 38., The tail 48 of th pawl, however, is also engaged by a lighter spring 50 which is secured to a boss 51 upon the pawl. carrier.

WV hen the fire lever 38 is pulled down and the pawl, carrier 47 is rotated with the winding shaft 39 the tail 48 of the pawl is withdrawn from engagement with the spring 49 and then is subject to the influence of the spring 50 so that whenthe fire lever 38 is released the spring 50, acting upon the tail 48, throws the pawl out of the path of the stop 44; consequently, the subsequent pulling down of the fire lever 38 cannot actuate the sector until the tailv 48 is again engaged by the spring 49 and restored to normal condition. Thus interference with the proper transmission and repetition of the fire alarm signal is avoided.

It will be obvious, therefore, that by rea son of the construction above described the break wheel shaft may be rotated by the watchmans key to send in one, or a limited number of rounds of signals without actuation of the fire lever. Also, that the break wheels may be rotated a greater number of times through the pulling of the fire lever to send ina predetermined number of signals.

One of the principal featuresof the invention consists in providing circuit conditioning meanewhich will enable a report signal such as a. watchmans signal to be sent in without actuating or modifying the condition of the fire alarm c rcuit, the

mechanism being so constructed as to select. and place in OPGTZLUYQlfilatlOn the desired circuits for transmitting the fire signal either to the central station or to local gongs or such other destinations as sired.

A simple mechanism of this character which is embodied herein comprises a systern of cams, levers and locking means which are operated only upon the pulling of the fire lever to establish the proper relation of may be de the circuits through which the signals are transmitted In the preferred embodiment of the invention disclosed herein (see Figs. 2 and the winding shaft 39 is provided at its end with a cam 52 which engages a shoulder 52 upon a lever 53 which is pivotally mounted upon the frame plate 8, the lever having at its opposite end an insulated stud which engages an arm upon a circuit contact spring so that when the lever is moved under the influence ot the cam it will move the circuit contact spring into engagement with a cooperating circuit contact spring, said circuit contact springs being mounted in a suitable bracket or holder carried by the frame plate 8 and suitably insulated from each other.

The lever 53 is provided with a finger 56 which is adapted to be engaged by a hookshaped locking dog 57 which is pivotally mounted upon a stud 58 on the frame plate 8 and is pressed toward engaging position by a spring 59. The locking dog 57, how ever, is normally held out. of engagement with the finger 56 by a cam 60 which is fixedly secured upon the end of the main shaft 10 and engages a shoulder 61 upon the lock ing dog. When the main shaft is rotated by the watchmans key the cam 60 is merely withdrawn from engagement with the shoulder 61 of the locking dog and consequently the circuit conditioning means are unaffected during the sending in of the watchmans signal.

hen, however, the fire lever 38 is pulled the cam 52 upon the end of the winding stud presses against the shoulder 52* of the lever 53 rocking it upon its pivot so that the circuit contact springs are forced into engagement with each other. At the same time the actuation of the main spindle 10 through the sector ll withdraws the cam 60 from locking engagement with the dog 57 permitting the latter, under the influence of the spring 59, to engage the finger 56 of said lever, thus locking the lever in such amanner to maintain contact between the circuit contact springs during the entire period of rotation of the break whee-l spindlcs, consequently enabling the signal. to be transmitted through the circuit formed by th contmtiug of the springs.

In the operation oi the transmitting mechanism the break wheels 18 and 19 are provided with teeth corresponding in numher and in spacing to the signals to be given. The teeth oi the wheel. 18 serve to open the normally closedsignalling circuit, while the teeth of the wheel .19 serve to close the normally open ground circuit.

The conditioning circuit which is conrolled by the cam and lever mechanism above described is connected to a circuit leading to a breaking mechanism as to be operable only when the fire signalling lever is pulled.

The circuit or circuits employed in the system in which the mechanism illust'ated in Figs. 1 to 6 of the accompanying drawing is utilized is illustrated diagrammatically in Fig. 7 01 the drawing in. which the current furnished by a battery B passes through a conductor a to a relay I) which may control a gong or a recorder in the central office. From the relay the current passes through a conductor 0 to the terminal (l of the first box. From this terminal the current passes through a suitable conductor to the circuit contact spring 6 thence through the circuit contact spring f which is normally held in contact therewith and adapted to be operated by the break wheel; thence to the terminal 9 of the first box and from this terminal to the first terminal (Z of the second box, from which it passes through the spring contacts 6 and f to the terminal 9 of the second box. From this terminal the current passes to the terminal (Z of the third box, thence through the spring contacts 6 and f to the terminal 9 of the third box, from which it passes to the line 72 through the knife switch 2' which is shown as normally closed and conductor 73 to the battery 13. Inasmuch as all of these contacts are normally closed the entire system is maintained under a constant supervisory current.

hen a report signal such as a watchmans signal is rung in the rotation of the break wheel 18 causes the code teeth thereon to break the contact between the contact springs 6 and 7, thereby tie-energizing the relay Z) and causing the same to actuate the signalling device in the usual manner.

In the construction illustrated in Figs. 1 to 6 the break wheel is illustrated as being provided with the usual four-toothed presignal indicating that the signal is a fire signal before the box number is rung in. This pie-signalling, however, is unnecessary in this type of circuit since the fire signal may be recognized by reason of the repetition of the signal. If desired, the break wheel may be provided with a special set of more closely arranged teeth for producin the re vcrt or watchmans signal. as 2- r M; in his signal more rapidly than the signal.

An auxiliary branch desirably is provided for transmitting the fire signal having conditioning means automatically operable upon transmission ofthe fire alarm to connect the branch into operative relation with the relay.

in the mechanism illustrated in the accompanying drawings the circuit conditioning means is connected into the circuit above described by connecting to the contact spring shown in Fig 9 10 and l1, which will send f a conductor m which leads to the circuit contact spring a. A complementary circuit contact spring 0 is connected by a conductor 79 to the return conductor h. hen, therefore, the fire signalling lever 38 is pulled (see Fig. 2) and the lever 53 actuated to close the contact spring a and 0 the, current will flow from the battery not only through the supervising circuit above described, but

also through the conductor a, relay b and conductor 0 tov the terminal d of the first box, thence through the contact springs e and f and conductor m of the branch to the contact springs 71- and 0 which are closed by the action of the lever 58', thence through the conductors p and h to the switch 2' and finally through the conductor 72 to the battery B so that when the contact springs 6 and f are separated by the action of the break wheel the fire signal will be; transmitted by the relay 6 to the central station and repeated until the clock mechanism has been run down. In case any of the other boxes are pulled the course of the signalling current is similar to that above described.

The ground circuit, which is adapted to be operated in the event ofa break inthe maincircuit comprises spring contacts 1' and s which are normally open and are closed by the break wheel 19, which connect portions of the main circuit tothe grounded terminal at and operate in the usual manner.

In Fig. 8 a modified circuit wiring is shown, which comprises a watchmans circuit and central station and a fire signalling circuit as above described and also a local fire signalling alarm which is operated by a separate relay and. separate battery.

The ground circuit is also illustrated in connection with this circuit. The Wiring and mechanism for the supervised main circuit and central station fire signalling circuit is as follows :The,current from the battery B flows through the conductor a, relay 1), line 0 through the terminal J ot the first box, thence through the spring con tacts e and f which are normally closed,but

operable by the break wheel 18, to. the terminal g" of the first box, thence to the terminal (Z of the second box and through the second and third boxes in the'unanner above described and through the return, line h to the switch 2" and finally through the conductor k to the battery B. The supplemental circuit in this construction is supplied with a current from a separate battery M and passes through the conductor Z to the terminal m of the first box, thence through the contact spring 02 of the circuit conditioning means and complementary spring 0' which is adapted toibe operable by the lever 53 to the terminal m ot the second box and through the conditioning mechanism thereof to the lever n of: the third box, and so on throughout the system, and through the re .ditioning contact spring 0/.

nally closed. Upon pulling, however, of

the fire lever the contact springs n and 0 are separated so that the making and breaking of a contact between the springs s. and 25' will transmit a signal through the supplemental line and relay 1" thereby actuating the local gong signalling mechanism.

The box mechanism through which this signalling system is operated is illustrated in Fig. 10 of the drawing. It will be noted that the clock work mechanism, including the main shaft, winding shaft and break wheel shaft are the same as those illustrated in Figs. 1 to 6 inclusive'and that the con.- tact springs through which; the signal; system is operated are the same except that an additional break wheel is provided to actuate the additional contact spring 5 and t and also that the circuit conditioning spring contacts are normally closed,the lever 53 acting to break the contact instead of maksignals being transmitted over different branches of thesame circuit, thewatchmans signal being cut out during the transmission of the fire signal and: the fire signal being normally shortecircuited while in: the at rest position, so that interference be tween the watchmans signal and the fire signal is prevented: In this alarm system separate relays are employed for actuating the watchman or central station signal and the fire alarm signal, thev watchmans signal being actuated through a high resistance relay operable by'a current for example of 25 'milliamperes and the fire signal through a low; resistance relay operable by 100 to, 150 or more milliamperes which will be unaffected by the operation of the high resistance relay. 7

In this construction also a suitable resistance is placed in the circuit. tonormally restrict the supervising current to that of the high resistance relay.

In. this system the current flows from the battery B through the conductor a3,lthe low resistance relay b conductor 0 high re.- sistance. relay (Z conductor e? to the termi nal f of the first box, thence through the conductor 9 and spring contacts 7?, 2', which are normally closed, through the conductor j thence through the contact springs and Z of the break wheel controlling the main or watchmans line leading to the central station, thence through the conductor m to the terminal a from which the current flows to the terminal of the second box and so on through the remaining boxes of the system, the current finally passing from the terminal a of the last box through the conductor 0 resistance 19 and return conductor r to the battery B The circuit conditioning device in this construction coniprises five spring plates several of which are maintained in spaced relation by an insulating member 63 which serves upon the separation of the spring contacts 72?, i by the lever 53 to close the supplemental circuit through which the fire alarm is sent. When the box is pulled the current passes from the battery through the conductor a relay b conductor 0 relay 6Z3, conductor 6 to the terminal f ct the first box, thence through the spring contacts 8 and t conductor a thence through the spring contact 2' and w to the terminal m whence it passes through the return liner to the battery cutting out the resistance and permitting a heavy current to flow through the line which will actuate the low resistance relay 6 thereby causing the operation of the usual gong or other signalling mechanism. At the same time the contacts g and 2 are closed, thus placing a short-circuit around the contact springs 7'2 and Z and preventing the Watchmans signal from being rung in during the transmission of the fire signal.

The box mechanism which is employed to actuate the circuit illustrated diagrammatically in Fig. 9 is illustrated in Fig. 11

of the drawing in which two superimposed break wheel circuits are employed, one to actuate the main line or watchmans signal and the other to actuate the fire alarm signal. The circuit conditioning means as above stated comprises five con-tact members, the second and fourth of which are united by an insulating spacing member 63. When the contact spring 2' is actuated by the lever 53 it breaks the normal circuit through the spring contacts k and i and makes contact with the spring co of the branch. At the same time the insulated spacing member 68 closes the shunt circuit through the contact 7 thus short-circuiting the contact springs 70 and Z and preventing the watch signal from interfering with the fire signal.

It will be understood that the various mechanisms specifically disclosed herein and the wiring systems diagrammatically shown are merely illustrative of some of the simple modifications which can be made in the apparatus to control various types of circuits and that by substituting different break wheels and different circuit conditioning devices the box mechanism may be employed to transmit signals through a wide variety of wiring systems.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

l. A signalling device comprising a spring actuated main spindle, a circuit breaking device operable by the rotation of said main spindle under the action of its spring, a winding spindle, means operable thereby for winding the main spindle in opposition to its spring, circuit conditioning means, means operable by the winding movement of said winding spindle to set said circuit conditioning means to signal transmitting position, means for retaining said circuit conditioning means in signal transmitting position during a predetermined period of rotation of said main spindle by its spring and means operable by said main spindle to restore said conditioning spring to normal position at the end of said predetermined period of signal transmitting rotation.

2. In a signalling device having a spring actuated main spindle and a winding spindle, means operable thereby for winding the main spindle in opposition to its spring, cams on the respective spindles, circuit conditioning springs, means operable by the cam on the winding spindle for setting the circuit conditioning springs to signal trans mitting position and means operable by the cam on the main spindle for restoring the conditioning springs to normal position.

3. A signalling device comprising circuit breaking means including a break wheel, a spring actuated main spindle having means for rotating said break wheel, means whereby said main spindle may be given a partial rotation only to cause a report signal to be transmitted, a winding spindle having means for actuating said main spindle to cause said'break wheel to produce repeated signals, circuit conditioning means compris ing contact springs, a lever for positioning said contact springs to conduct said repeated signals, a cam operable'by said winding spindle to cause said lever to position said conditioning springs in signal transmitting relation and means for locking said lever during the transmission of said repeated signals.

4. A signalling device comprising circuit breaking means including a break wheel, a spring actuated main spindle having means for rotating said break wheel, means where by said main spindle may be given a partial rotation only to cause a report signal to be transmitted, a winding spindle having means for actuating said main spindle to cause said break wheel to produce repeated signals, circuit conditioning means comprising Contact springs, a lever for positioning said contact springs to conduct said repeated signals, a cam operable by said Winding spindle to cause said lever to position said conditioning springs in signal transmitting relation, means for looking said lever during the transmission of said repeated signals and 21 earn on said main spindle operable by the spring actuated rotation of said main spindle to release said lever locking means.

In testimony whereof, I have signed my name to this specification.

JOHN C. FRANCIS 

